Just 6 kilometers (about 4 miles) of briny water separate the ocean's surface from the depths known as the hadal zone. Yet for as much as we know what lurks in its cold darkness, it might as well ...

Beneath the ocean’s surface, at depths where sunlight cannot reach, lies one of Earth’s most mysterious frontiers: the hadal ...

The open ocean’s twilight zone, a vast deep ecosystem rich in fish biomass, is poorly understood because it is expensive and challenging for humans to reach its depths 200–1000 meters (660 ...